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Aluminum alloys are applicable in marine and aero fields. Alloys AA5083 and AA6061 are aluminum alloys with different chemical and physical properties. Combination of two dissimilar materials could result in enhanced strength. Generally, dissimilar aluminum alloy joint is made by friction stir welding (FSW) to achieve improved physical properties compared with the parent alloys. The purpose of this research is to develop a new FSW dissimilar material with enhanced properties using AA5083 and AA6061 alloys.

In this research, FSW joint was made for butt joint configuration using AA5083 and AA6061 aluminum alloys. Cylindrical pin with threaded profile was used to perform the joint. The tool tilting angle was maintained as constant, and the tool rotational speed and the welding speed were varied. Wear performance and mechanical strength of the joint were analyzed.

The results revealed that the increase of tool rotational speed led to poor wear performance, whereas increase of welding speed showed a better wear performance. Further, the prepared joint was analyzed for different wear parameters such as sliding velocity and applied load. The results displayed that the increase of sliding velocity exhibited low wear rate and the increase of load showed high wear rate.

This work is original and deals with the wear performance of AA5083–AA6061 joint at different tool rotational and welding speeds.

To expand understandings of conflict, this chapter offers a detailed assessment of how exchange is enacted within local heroin markets. Addressing drug dealing and heroin users’ buying drugs for their peers (i.e., brokering), this research expands how illegal drug markets are commonly understood. A generalized framework is presented that highlights patterns of exchange.

Findings come from a 36-month study of a demographically diverse sample of 38 heroin users in Cleveland, OH. Methods involved open-ended, semi-structured interviewing and participant observation, conducted by the author and a team of graduate students.

Instead of framing exchange as either an economic or social act, this chapter shows how trade in heroin markets is often both. Here Gudeman’s (2001) dialectic between market and community is embodied in inter-subjectivities of traders, promoting both trust and conflict. In this context, conflict is the result of perpetual ambiguity all market participants can experience.

Applying a blended notion of exchange as both social and economic offers new insight on conflict and expands its orientation beyond narratives of political economy. Here, in addition to the economics that often promote conflict, the social elements of exchange (e.g., reciprocity) are emphasized.

Research has understood conflicts in drug market operations through trader characteristics (e.g., poverty, race, class, privilege). This chapter emphasizes opportunities for conflict irrespective of individualized characteristics by outlining structural elements of exchange.

The purpose of this paper is to contribute a model that would facilitate the infusing of quality and reliability in new products by blending Six Sigma concept and new product development (NPD) process.

A model called QUARNEWSS (stands for QUA – quality, R – reliability, NEW – new product and SS – Six Sigma) was designed. QUARNEWSS blends four stages of NPD process with Six Sigma's DMAIC improvement methodology and belt-based training infrastructure. After designing, QUARNEWSS was adopted to infuse quality and reliability in a new product being developed at a compressed air treatment products manufacturing company.

The implementation experience indicated that QUARNEWSS could act as a vehicle for systematically infusing quality and reliability in new products.

The contribution of QUARNEWSS model through this paper is valuable on considering the fact that modern customers demand new products with high degree of quality and reliability.

This paper aims to research people who sell cannabis in public spaces known as “drug places” in Frankfurt, Germany. A particular focus is set to the relations of identity formation, relations to other dealers and law enforcement, taking into account the concept of “street capital” as social and cultural capital accumulated in the practice of drug dealing in public.

Nine biographically oriented qualitative interviews were conducted directly within the respective “drug places” in the inner city and the margins of the local open drug scene with exclusively male subjects. Interviews were conducted in German, audio-recorded and transcribed. Data was analysed with structured qualitative content analysis.

All respondents had some degree of migration background, ranging from German citizens up to refugees with illegal residence permit status. Social deprivation, socio-cultural conflicts with parents, combined with often early own drug use (mainly cannabis and cocaine) and stigma had contributed to a precarious existence. Experiences of criminalisation did not discourage the respondents from the continuation of their selling activity. Violence in these settings was likely but assessed in highly different ways depending on attitudes and experiences. The same is true for diverging experiences with police, however, the threat of being criminalised is always present.

As mostly independent and solitary dealers, this study researched a rarely investigated group. While these respondents have developed skills or street capital to survive in the respective setting, they are caught between unfavourable social conditions, social exclusion, violence, law enforcement and own drug use, leading to a desperate and fatalistic mindset. Somewhat paradoxically, this fatalism may be regarded as a result of keeping control over their own actions.

This paper outlines how, in many ways, the drug market is not what it is commonly assumed to be and that, as such, we need to reconceptualise how we understand both the drug market and the drug dealer. It briefly reviews the research showing that many of the core activities thought to characterise drug markets and drug dealing are unreasonably exaggerated or even essentially fallacious. It then seeks to demonstrate that the drug market doesn't even look the way it is assumed to look, in terms of its shape, structure and personnel. The issue of social supply is held up as an example of how unhelpful the current view is, particularly around cannabis and young people, and as evidence that the ‘house of cards’ that is the current conceptualisation of the drug market and the drug dealer needs reappraisal along with policy that is currently insufficiently nuanced to respond appropriately.

The study aims to model the factors influencing online learning adoption by Indian students as well as examine the mediating effect of attitude on the proposed relationships.

A survey was conducted online using a well-structured questionnaire. The target respondents of the study were students of undergraduate and postgraduate courses in India. Structural equation modeling was employed on a final sample of 402 respondents to test the proposed hypotheses.

The results reveal that there is a significant impact of the perceived usefulness, perceived ease of use, social influence, peer influence and self-esteem on attitude toward online learning. Further, attitude significantly mediates the impact of these factors on intention to adopt online learning.

The study is one of the initial attempts in the backdrop of the pandemic to examine the mediating role of attitude in affecting intention to adopt online learning by university students in India.

This paper aims to investigate the effect of laser surface texturing (LST) on the wear behavior of C-263 nickel-based superalloy and to identify the optimum wear operating condition.

C-263 nickel-based superalloy was selected as substrate material and pico-second Nd-YAG laser was used to fabricate the waviness groove texture on their surface. Wear experiments were designed based on Box-Bhenken design with three factors of sliding velocity, sliding distance and applied load. Wear experiments were performed using pin on disc tribometer. Morphologies of textures and worn-out surfaces were evaluated by scanning electron microscopy and energy dispersive spectroscopy. Surface topographies and surface roughness of the textures were evaluated by weight light interferometry. The response surface methodology was adopted to identify the optimum wear operating condition and ANOVA to identify the significant factors.

LST improves the wear resistance of C-263 nickel-based superalloy by appeoximately 82 per cent. Higher wear rate occurs at maximum values of all operating conditions, and applied load affects the coefficient of friction. Applied load significantly affects the wear rate of un-textured specimen. The interaction of sliding velocity and applied load also affects the wear rate of textured specimens. The optimum parameters to get minimum wear rate for un-textured specimens are 1.5 m/s sliding velocity, 725 m sliding distance and 31 N of applied load. For textured specimens, the optimum values are 1.5 m/s sliding distance, 500 m sliding distance and 40 N of the applied load.

Literature on laser texturing on nickel-based superalloy is very scarce. Specifically, the effect of laser texturing on wear behavior of the nickel-based superalloy C-263 alloy is not yet reported.

The purpose of this paper is to compare Taiwanese male and female cadets’ attitudes toward women in policing. Specifically, this study assesses whether female and male recruits differ in: their assessment of women in policing; and their preferred roles of women in policing.

Surveys were conducted with 438 cadets (229 males and 209 females) who received recruitment training at the Taiwan Police College in 2011. This methodology provided a rich sample to explore police recruits’ attitudes toward women in policing.

Although male cadets had reservations about females’ capability and physical strength in handling certain aspects of police work, they supported women being assigned to equal or similar duties as men upon entry into the police force. Compared to male cadets, female cadets were more likely to perceive females as being competent as males and thus adequate for police work. Nevertheless, female cadets were reluctant to embrace women's integration into police work, which might require them to perform duties similar to or the same as those of men, such as patrol.

It should be noted that the survey in the current study was conducted while recruits were going through training at the police college. The authors cannot rule out the possibility that surveys conducting under this type of circumstances may result in socially desirable responses. Future study should include surveys with cadets at different stages of their training (before, between, and at the end of the training) to further examine if the levels of recruits’ receptiveness to gender integration change over time.

This finding highlights the importance of equipping female recruits with mental preparation and physical skills. The training at the academy should prepare cadets with the required skills to serve as patrol officers to boost their confidence. Equally important is to provide suitable training to help cadets raise stress awareness and develop coping mechanisms.

Most studies conducted in the past have mainly focussed on police officers’ perceptions of women in policing. Only a handful of studies examine future police recruits’ attitudes toward women in policing, and most of these studies are conducted in western countries. A better understanding of police recruits’ attitudes toward women in policing in a non-western cultural setting can provide insight into theoretical and policy perspectives related to these issues.

Cities have long been of interest to international development as well as to criminology. Historically, criminology as a social science emerged as a response to urbanisation and the new opportunities created by cities for criminal activity and victimisation. Thus, Sustainable Development Goal 11 (SDG 11), which ‘aims to make cities and human settlements inclusive, safe, resilient and sustainable’, is ripe for criminological input and analysis. SDG 11 tackles housing and basic services, transport systems, urban planning, cultural and natural heritage, disaster prevention, environmental impact, and safe, inclusive, and accessible green and public spaces. There has been ample criminological research on crime and victimisation in various types of human settlements, on transport systems, on the looting and trafficking of cultural heritage, on crimes associated with natural disasters and on the importance of public leisure areas for crime prevention. Yet many of the above goals, as well as the recommendations emerging from these bodies of research, conflict with each other, and must be problematised in their aim to be inclusive of all. Women and children, the elderly and persons with disabilities are usually the reference groups for inclusion, but globally, there are many other groups, including racial and ethnic minorities, indigenous communities, and LGBTQI individuals that are commonly excluded. The chapter will analyse SDG 11 against the evidence base of urban criminology as well as the challenges for inclusion, given diversity both within-country as well as globally.